March 9, 2018

Many students oftentimes are not sure what their strategy should be for studying for standardized exams, science and math classes. My answer is always practice, practice and practice more.

A student should practice all the quizzes, tests, HW and classwork problems the teacher gave, as well as end of the chapter problems. For standardized tests, use different sources for practice to see different wording of questions on t...

March 8, 2018

College can be very stressful and bring anxiety with the never ending papers and tests. So how do you ease your anxiety and prepare for the tests?

1. Make a list of tasks that need to be done in order of priority. Seeing an organized list will help you feel less overwhelmed and get prepared ahead of time.

2. Make a to-do list everyday.

3. Reward yourself for every task accomplished. This could a yummy dinner, a nice walk,...

March 6, 2018

What is the number of moles of KF in a 29-gram sample of the compound?

(1) 1.0 mol

(2) 2.0 mol

(3) 0.50 mol

(4) 5.0 mol 

Answer and Solution:

To find the number of moles, you can look at the reference table Table T and find the formula for moles.

Number of moles = given mass/ gram-formula mass

Therefore let's use first fine the gram formula mass by looking at the periodic table. K has a mass of 39g/mol and F is 18.998 g/mol. Th...

March 5, 2018

Oftentimes, when we do organic chemistry problems we must determine what kind of reaction we have. For the SN1, SN2, E1 and E2, our substrate will have a leaving group that will leave in the process of the reaction. So how can we identify leaving groups and tell which ones are better? Well, a leaving group is considered to be a good leaving group if, after it leaves, it is stable on its own. Therefore leaving groups tha...

March 4, 2018

A rhombus is a parallelogram with four congruent sides. However, this questions is asking us about diagonals. A parallelogram will be a rhombus if its diagonals bisect pairs of opposite angles, but not each other, making choice 2 wrong. Also, If a parallelogram is a rhombus, the diagonals are perpendicular, making c

March 3, 2018

  1. Which statement describes the location of 5 protons and neutrons in an atom of helium?

    1.   Protons and neutrons are in the nucleus.

    2.  Protons and neutrons are outside the

      nucleus.

    3.   Protons are outside the nucleus, and neutrons are in the nucleus.

    4.   Protons are in the nucleus, and neutrons are outside the nucleus. 

Answer and Explanation:

There are three subatomic...

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